MessageEmitter和MessageLogger支持打开和关闭日志记录的能力，以及记录到平面文件的选项。
Message Emitter and Message Logger enable the ability to turn logging on and off, as well as the option to log to a flat file.
注意到平面图中显示的左侧的一盏灯处于开启状态，而右侧的一盏灯处于关闭状态。
Notice that the floor plan shows a light on the left that is turned on and a light on the right that is turned off.
至少在所述盖关闭的情况下，在被覆盖区域中形成有封闭的平面区域形成。
A closed planar area is formed in the covered area, at least with the lid closed.
至少在所述盖关闭的情况下，在被覆盖区域中形成有封闭的平面区域形成。
A closed planar area is formed in the covered area, at least with the lid closed.
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